I think the main claim the OP is trying to get at is he was returned his $500 deposit for the third account but the casino did not give him anything for the second account he created where he was over $10,000 in losses. If the OP declared he had an addiction and was spiralling out of control and was still allowed to open a second then third account, it makes no sense to return deposits for the just the third account. If the casino accepting some degree of blame then it cannot just be for one account (unless the OP has withheld some vital information).

You are right, going by what he wrote he does need help.

In the end, whatever resolution the OP might have with the casino I hope he does speak to trusted family and/or friends to explain his addiction and then does seek appropriate help with their support.